真(zhen)(zhen)空(kong)(kong)(kong)，這一術語譯自拉丁文vacuo，其(qi)意義是(shi)虛無。其(qi)實(shi)真(zhen)(zhen)空(kong)(kong)(kong)應理解為氣體較稀薄的(de)(de)空(kong)(kong)(kong)間(jian)。在(zai)指定(ding)的(de)(de)空(kong)(kong)(kong)間(jian)內，低(di)于一個大(da)氣壓力(li)的(de)(de)氣體狀態統稱(cheng)為真(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)狀態下氣體稀薄程(cheng)度(du)稱(cheng)為真(zhen)(zhen)空(kong)(kong)(kong)度(du)（degreeofvacuum），通常用(yong)(yong)壓力(li)值表(biao)示。因此真(zhen)(zhen)空(kong)(kong)(kong)包裝(zhuang)(zhuang)實(shi)際上不是(shi)完全(quan)真(zhen)(zhen)空(kong)(kong)(kong)的(de)(de)，采用(yong)(yong)真(zhen)(zhen)空(kong)(kong)(kong)包裝(zhuang)(zhuang)技術包裝(zhuang)(zhuang)的(de)(de)食品(pin)容(rong)器內的(de)(de)真(zhen)(zhen)空(kong)(kong)(kong)度(du)通常在(zai)600-1333Pa。所(suo)以(yi)，又(you)將真(zhen)(zhen)空(kong)(kong)(kong)包裝(zhuang)(zhuang)稱(cheng)為減(jian)壓包裝(zhuang)(zhuang)或(huo)排(pai)氣包裝(zhuang)(zhuang)。